treesitter: allow setting of treesitter max_lines to be string for percentage values

docs/manual/release-notes/rl-0.9.md

@@ -444,5 +444,7 @@ https://github.com/gorbit99/codewindow.nvim
 - Add `vim.treesitter.indent.excludes` to exclude filetypes from the treesitter
   indentation; e.g. useful for Haskell and PureScript, for which treesitter
   indentation does not work good
+- Allow `vim.treesitter.context.setupOpts.max_lines` to also be given as a
+  string in order to allow percentage values like `"20%"`
 
 <!-- vim: set textwidth=80: -->

modules/plugins/treesitter/ts-context/context.nix

@@ -1,6 +1,6 @@
 {lib, ...}: let
   inherit (lib.options) mkOption mkEnableOption;
-  inherit (lib.types) int bool str nullOr enum;
+  inherit (lib.types) int bool str nullOr enum either;
   inherit (lib.nvim.types) mkPluginSetupOption;
   inherit (lib.nvim.config) batchRenameOptions;
   migrationTable = {
@@ -26,12 +26,14 @@ in {
 
     setupOpts = mkPluginSetupOption "treesitter-context" {
       max_lines = mkOption {
-        type = int;
+        type = either int str;
         default = 0;
         description = ''
           How many lines the window should span.
 
-          Values >= 0 mean there will be no limit.
+          Can be an absolute line number (given as int) or a percentage (given as string, e.g. "20%").
+
+          Values <= 0 mean there will be no limit.
         '';
       };